Method of making pistons.



G. H. DYER & H. E. MACK, JR. METHOD OF MAKING PISTONS.

APPLICATION FILED JULY 20 1910. 1,102,188, Patented June 30,1914.

2 SHEETS-SHEET 1.

/A//// I I I v g 10 l g 1 i i a i 5 1L.

i j I l ;:ZZ- l ,Z LQ' .3.

, Z fl G. H. DYER 8r. H. B. MACK, JR. METHOD OF MAKING PISTONS.

APPLICATION FILED JULY 20, 1910.

Patented June 30, 1914.

2 SHEETS-SHEET 2.

. fizz/Mars ED STATES PATENT OFFICE.

GEORGE E. DYEB, OF NEW YORK, N. Y., AND HENRY E. MACK, J'Bt, 0F BOSTON,

MASSACHUSETTS.

METHOD OF MAKING PISTONS.

Specification of Letters Patent.

Patented June 30, 1914.

To all 'whom'it may concern:

Be it known that we, Gnonon H. Drnn and HENRY E. MACK, J r., citizens of the United States, residing at New York, county of New York, State of New York, and Boston, county of Suffolk, State of Massachusetts, respectively, have invented certain new and usefullmprovements in Methods of Making Pistons; and we do hereby declare the following to be, a full; clear, and exact description. of the invention, such as will enable others skilled in theart to which it apper tains to make and use the same.

This invention relates to istons, more particularly to pistons for internal comustion engines, and the method of making the same. So far as is known to the inventors, such pistons are at present made of cast metal and as so ,made are subject to various disadvantages well known to those skilled in the art.

The object of the-present invention is to produce a piston, and provide a method of making the same, which will gain additional strength and decrease in Weight or both, over cast nietalpistons and in addition at, tain .a more perfect balance.

To this end theinvention contemplates a method of makingpistons which consists drawingup a piston body from one piece 0 sheet metal, preferably sheet steel, and

then uniting to-said piston-body wrist-pin bearings placed in suitable diametrically disposed openings formed in the piston body for their reception.

Thepreferred manner of pract slngthe invention to make the piston is hereinafter described and particularly defined in the appended claims.

The invention will be more readily under Eli are l'showsa cross section of due form of piston body drawn from Show. metal;

wrist-pin body, as this form has been found to provide 'ings 1 are beveled, or chamfered o shown at 15. In the preferred method :maanfasture Fig. 2 is a plan view of the piston body shown 1n Fig. 1 with diametrically disposed openings formed therein for the reception of the w r'ist-pin bearings; Fig. 3 is a plan view sinnlar to Fig. 2 showing the wrist-pin hearings in place and the piston body provided at one end with suitably spaced rings forming packing ring recesses; Fig. 4 is a central section on the line 44 of Fig. 3; Fig. 5 is a detail illustrating the method of uniting the spaced rings to the iston body; and Figs. 6 and 7 show a modi ed construction to bedescribed, Fig. 7 being a central section on the line 77 of Fig. 6.

Referring first to Figs. 1 to 5, in practis ing the preferred method of making pistons contemplated by this invention, first a piece of sheet metal, preferably sheet steel, is drawn up for use as a piston body, in the form shown in Fig. 1, having a portion 10 at one end of less diameter than the main portion 11 of the body. It is preferred, although not essential, that the wristin bearin s 12 (see Fig. 4:), to be used, e provide with one or more radially disposed, reinforcing webs 13. Preferably these webs are triangular in section increasing in depth from the inner ends of the earings to the wall of the piston successfully for the desired reinforcement of the bearin s. For the reception of these wrist-pinearings, two diametrically 0pposed openings 14 (Fig. 2), suitably shaped to receive them, are formed in the walls of the main portion 11 of the piston body. The reinforced wrist-pin bearings 12 are then set in the openings 14- substantially vflush with the outer surface of the piston -body, as shown in El 4, and are firmly united to the piston b0 y by welding. Preferably the .autogenous method of welding 1s used and to this end the edges of the 0 ons of the wrist-pin bearings will be cut therein to put in the openings formed therefor undrilled and will be drilled. after having been welded in place. lln order to providesuitable recesses to hold the usual packing rings, the portion 10 or the iston body has united thereto a plurality oil suitably spaced rings 16 substantially equal in diameter to the diameter oi the main portion 11 of the piston body These rings also are preferably welded to the body autogenously and they he, therefore, conveniently provided with. beveled or charniered portions 1'? Referring now to Figs. 6 and 7, instead of forming the wall of the piston body of substantially the same thickness throughout and an end portion of less diameter, as shown in l ig; l, the piston body may conbe so drawn up as to leave the outside diameter same throughout its i but have provided a thickened end portion alter have a series oi circumferential slots 'l OlLill. suitable paclrinp; ring recesses 19; e and show also urther modification in that the head oi the piston body in addition the wristpin bea g openings le is provided with a transverse slot fill and connecting l two openings, in this construction oz? t to piston the wrist-pin hearings in addition to the reinforcing webs 13, connected by a transverse reinforcing web 21 which is opposed to the reinforcing webs and which, when the bearings are in place, tits within the slot 20 The web 21, in this form of the invention, provides a substantial reinforcement for the head of the piston. The wrist-pin bearings having the reinforcing web 21 may be united to the piston body at the meeting edges of" the hearings and webs with the body in any suitable manner preferably by autogenous welding as described for the form of the invention shown in Figs. 1 to 5. it should be understood, also, that the wristpin bearings provided with the additional. reinforcing web 21 may be assembled with a piston body drawn up in the form shown in Fig. 1 if so desired, or, it is deemed preferable to use the form of piston body shown in. Figs. 6 and 7 wrist-pin bearings with or without the transverse reinforcing web 21 may be used therewith,

li fhile in the following claims various steps in the method of making the piston of the present invention are recited in a certain defined sequence, it should be understood that the method is not limited to the exact sequence recited but on the contrary it. is particularly pointed out that variations from. sequence or the steps as claimed This end portion may thereextending radially from incense are considered to be within the spirit and scope of the invention,

Having thus described the invention, what is claimed as new is 1. The method, or making pistons which consists in drawing up a piston body from one piece of sheet metal; then forming diametrically opposed suitably shaped Openings therein for the reception of wrist-pin bearings; and then securing the hearings in said openings substantially flush with the outer surface of the piston, by welding.

2, The method of making pistons which consists in drawing up a piston body from one piece of sheet metal; then forming diametrically opposed openings therein shaped for the reception or? wrist-pin bearings haw ringone or more outwardly projecting reinforcing webs; and then setting said bearwithin said openings until substantially flush with the outer surface of piston body and uniting; them thereto autogenously w The method of making pistons which consists in drawing up a piston body from one piece or sheet metal having; one portion of less diameter than the remainder of the body; then forming diametrically opposed, suitably shaped, openings in the portion of the body of larger diameter for the reception of wrist pin bearings; and then securing the bearingsin said openings by welding and also securing a plurality of suitably spaced rings on the portion of the body of lesser diameter by welding.

l. The method of making pistons which consists in drawing up a piston-body from one piece of sheet metal having one end portion of less diameter than. the remainder oi the body, but having its wall ozt'substantially equal thickness throughout; then forming diametrically opposed openings in the portion. or the body 0i? larger diameter shaped. for the reception of wrist-pin bearings having one or more outwardly profleeting reinforcing webs; and then secur ing the bearings in place at the interioroi' the piston body by welding them to the body while in said openings and also unitinp; by welding, to the portion of the piston body of lesser diameter a plurality of suitably spaced rings substantially equal in diameter to the diameter of the larger pore tion of the piston bodyo a The method at makingpistons which ing one or more outwardly pi ojecting reinforcing webs at one side; then forming a slot connecting said openings across the head of the piston bod and then inserting in said openings and ot-wrist-pin bearings connected by a transverse reinforcing web and uniting all of said parts to the piston body by welding. y

6. The method of making pistons which consists in formin a piston body having one end portion 0 less diameter than the,-

remainder of the body, and welding a plurality of rings on the end portion of less diameter.

7. The method of makin pistons which consists in drawing up a ho ow piston body of sheet metal and securing wrist-pin bearings within said hollow piston body.

' GEORGE H. DYER.

HENRY E. MACK, JR.

Witnesses to the signature of Henry E. Mack, J r.: WARREN G. OGDEN, RUTH A. SmoNns. 

